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The dermatome is the dorsal portion of the paraxial mesoderm somite which gives rise to the skin . In the human embryo, it arises in the third week of embryogenesis. [2] It is formed when a dermomyotome (the remaining part of the somite left when the sclerotome migrates), splits to form the dermatome and the myotome. [2]
Once cells have adopted somite fate they undergo an epithelial-mesenchymal transition and form a new somite. [11] The position of the somite boundary is thought to be controlled by a gradient of FGF or Wnt signalling that moves posteriorly at the rate that the embryo elongates and grows [3], thus coupling somite size to the size of the embryo ...
The wavefront progresses slowly in an anterior-to-posterior direction. As the wavefront of signaling comes in contact with cells in the permissive state, they undergo a mesenchymal-epithelial transition and pinch off of the more anterior pre-somitic mesoderm, forming a somite boundary and resetting the process for the next somite. [1]
Earthworms are a classic example of biological homonymous metamery – the property of repeating body segments with distinct regions. In biology, metamerism is the phenomenon of having a linear series of body segments fundamentally similar in structure, though not all such structures are entirely alike in any single life form because some of them perform special functions. [1]
Many kinds of tissue derive from the segmented paraxial mesoderm by means of the somite. Among these are: the sclerotome, which forms cartilage, the syndetome, which forms tendons, the Myotome, which forms skeletal muscle, the dermatome, which forms the dermis as well as skeletal muscle, and endothelial cells.
President Donald Trump said he would provide details Thursday of what he and Elon Musk's Department of Government Efficiency (DOGE) claim are billions of dollars of wasteful and fraudulent ...
Here's what misophonia is, what causes it and how people who struggle with it best find relief.
The anatomical term myotome which describes the muscles served by a spinal nerve root, is also used in embryology to describe that part of the somite which develops into the muscles. [3] In anatomy the myotome is the motor equivalent of a dermatome .